Improvement in machines for dressing stone



G. R. RAY.

I Machines for Dressing Shane. 1N6, 138,109, I A PatentedAprH22,l873.

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AM. PHOTO'LITHOEFMI'HIC ca mt (eseamvs's mums) UNITED STATES PATENTQFFIOE.

GEORGE 1t. BAY, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT IN MACHINES FOR DRESSING STONE.

Specification forming part of Letters Patent No. 138,100, dated-April22, 1873 application filed August 3, 1872.

To all whom it may concern:

Bridgeport, in the county of Fairfield and State of Connecticut, haveinvented a new and Improved Machine for Dressing Stone, of which thefollowing is a specification:

My invention relates .to improvements in stone-dressing machines, inwhich steel or other cutters or chisels are mounted in a rotarycutter-head, which is mounted on a support on the ends of radial arms,by which it is adjusted vertically to the work which is automaticallyfed along under the cutters, and the said cutter-head is caused totraverse laterally on its support by a feedscrew, and the radial frameis adjusted vertically by screws geared with a worm-shaft for turningthese said screws, and the worm-shaft being mounted on bearings sopivoted as to allow the screws to oscillate while working in nutspivoted to the radial frame to admit of the-vibration of the screwsnecessary for the working of the radial frame. The invention consists inthe improvement of machines for dressing stone, as hereinafter describedand pointed out in the claim.

Figure 1 is a longitudinal sectional elevation of my improved machinetaken on the line as w of Fig. 2. Fig. 2 is a plan view with some partsbroken out. Fig. 3 is a side elevation of the cutter-head and section ofone of the bearings. Fig. 4 is a transverse section of Fig. 3 on theline 3 3 Fig. 5 is a plan view of the water-discharging nozzles andsection of the cutter-head, showing the relation of the said nozzles tothe cutters. Fig. 6 is a side elevation of one of the tools and theadjusting collar.

Similar letters of reference indicate corresponding parts.

A is a platform of any suitable kind with a carriage, B, for feeding thestone slabs or blocks 0 along under the rotary cutting-chisels or toolsD mounted in a rotary head, E, on the end of a radial frame, F, which ispivoted on the driving-shaft G at one end and supported near the otherend on the adjustingscrews H, which are stepped in bearings I pivoted onthe bed-frame at K, and carrying the worm-shaft L, which gears with thesaid screws by pinions M for turning them to raise or lower the frame F,being turned, by belts from the pulley N on the pulleys O P, one beingcrossed and both being slack, so as not to turn the worm L, except whenbrought into action by a tightener. The stone-carrying table is drivenbya toothed bar, Q, pinion R, gears S T, and a belt from pulley U on thedriving-shaft G. The cutter-head is turned by the square shaft V, pulleyW, and abelt from. pulley X on the driving-shaft. The

journals c are mounted in bearings b, attached to a slide d, fitted onthe way 6 at the head of the frame F to traverse the tools forward andback over the carriage by means of a feedscrew, f. This cutter-head isfitted snugly in these bearings, one at each end, for holding it firmly,to prevent any trembling or vibrating such as it would be subject to ifmounted on a shaft with a bearing at each side of the frame F, and ithas a central or axial square hole, through which the shaft V forturning it passes loosely, so that the cutter-head can slide freelywhile being turned by it. .A hood, 9!, is arranged over the cutter tocause a draft of air backward under the frame F to carry the dust awayfrom the operator as much as possible. For securing the chisels or toolsto the cutter-head, I have a wide or slotted hole, h, for each tool,covered at each end with a metal plate, 2' 70, let into the head flushwith the surface. The. plate t has one hole to allow the chisel j toproject through, and the plate K has two", holes, one for the tool andanother for the screw -threaded end Z of a wedge, m, which, togetherwith another wedge, n, confined between the two plates t k, fasten thetool by wedging it against one wall of the hole, said wedge m beingcaused to act on the other by a nut on its screw-threaded end beingscrewed up, thus clamping the tool throughout the whole length of thehole, so that it will not tremble or chatter.

A gage of any approved kind may be used in adjusting the cutting edgesor ends of the tools to get them all the same distance from the axis, sothey will all cut alike; but I prefer to have a loose collar, a, with aset-screw, b, (see Fig. 6,) to each tool, and have two or more sets oftools, so that one set can be suspended while another set is at work,and to adjust the collars on the tools so that when.

the tools are put in the cutter-head with the collars against the side,said tools will all be set alike, and after they are secured the collarswillbe removed to be adjusted on another set of tools ready to put inwhen the dulled ones are removed.

To exclude the grit from the journals a and bearings therefor, thelatter have an annular recess, 19, formed around the collar q next tothe shoulder a"; and said collar is provided with one or more obliquescrapers, t, arranged to constantly scrape the grit which works inbetween the end of the bearings and shoulder r, away from the journal,together with the spent and gummy oil in a kind of paste, which keepsthe joint closed and prevents the grit from working in through the saidjoints between the end of a bearing and the shoulder r. A represents ashort pipe, with nozzles B mounted on the cutter-stock behind thecutter-head with a flexible pipe, 0, connecting it with a pump or otherforcing apparatus for discharging jets of water under high pressure uponthe stone to remove the chips and facilitate the action of the tools,particularly in dressing very hard granite. The said pipe A will bearranged in its supports so as to be oscillated so as to direct the jetsto the tools,

as new and desire to secure by Letters Pat-' cut- 1. The cutters J,secured in the cutter-head by the plates z k, wedges m n, and thescrewthreaded extension of one of the wedges and a nut, substantially asspecified.

2. The arrangement of the annular space 1) in the bearings of thecutter-head, and the oblique scrapers t on the latter in said space toexclude the grit and dust, substantially as specified.

3. The combination of the water-pipe A, nozzles B, and a flexible pipe,0, with the rotary chisels and the oscillating frame F arranged fordischarging water-jets upon the stone where the tools act upon it, andat the same time, substantially as specified.

GEORGE ROBERT RAY.

Witnesses ELIPHALET B. STEvENs, SAMUEL TYNE.

